Improvement in adding-machines



2 Sheets--Sheet 2.

L'HOLMA'N. Adding-Machines.

Patented Aug. 4,1874.

W/TA/[SSES/ UNITED STATES PATENT OEEIcE.`

CALVIN J. HOLMAN, OF TOLEDO, OHIO.

IMPROVEMENT flN ADDING-MACHINES.

Specification forniingpart of Letters Patent No. 153,826, dated August4, 1874; application filed April 2l, 1874.

To all whom it may concern Be it known that 1, CALVIN J. HoLMAN, ofToledo, in the county of Lucas and State of Ohio, have invented certainnew and useful Improvements in Adding-Machine, of which the following isa specification:

This invention relates to certain improvements in portable addingmachines or devices in which numbered disks are operated by suitablemechanism for registering or adding numbers; and the present inventionconsists of a peculiar con struction and arrangement of parts whichrender the device more perfect and reliable in operation, as will behereinafter more fully described.

In the accompanying drawings, Figure l is a plan view of the outsidedisk or wheel with its knob for rotating the same. Fig. 2 is a view ofthe internal adding mechanism. Fig. 3 is a longitudinal central sectionof the same. Fig. 4 is Ia detached view of the cross-plate with thepawl-carrying lever and the stop-arrangement. Y

A designates a cylindrical casing, made of sheet metal or other suitablematerial, and composed of two disks or heads and a circumferential liange or rim. Said casin g is provided with two parallel openings, a b,near its rim, through which are exhibited the numbered rings or diskslocated within the casing and constituting the adding mechanism. Theouter annular ring or wheel B is located at the rim of the casing, andit has engraved or otheise applied to its front face numbers rangingfrom one to one hundred, and within said outer ring there is arranged asecondary ring or disk, C, which is numbered in correspondence with theouter wheel. The ring or wheel B has a continuous series of teeth, D,around its periphery extending at right angles therefrom, or it may beprovided with an ordinary racksurface. The movement of both internalrings or wheels is guided and retained in place by raised ribs or railsE applied to the inner side of one of the heads of the casing. rlhe ringC is formed with a ratchet-surface, F, around its inner periphery, withwhich engages apawl, G, carried by a lever, H. Said lever is fixed on anaxis or arbor, I, extending through the front head of the casing, andjournaled at its inner end ina plate, K, extending across the casing andsecured to the guide-ribs E. The arbor I is extended beyond the plate K,to adapt it for the reception of a coiled spring, L, the inner end ofwhich is secured to the arbor, while the outer end is attached to abracket, c, on the plate K. A spring-tongue, d, is attached to the plateK, for the purpose of causing said spring to be in frietional contactwith the inner ring, in order to prevent the same from becoming loose. Aspur-wheel, M, is located near the rim of the casing, and in proper"relation to the teeth of the outer ring or wheel, and a projection orstop, N, located exactly opposite the highest nunr ber on the inner ringO, operates it, as hereinafter described, for indicating hundreds. Thewheel M is mounted on an arbor or post between the head of the casingand a retaining-plate, O, secured to one of the ribs E, and said arboris extended and provided with a screw threaded extremity, which projectsthrough the loose head of the casing, so as to enable a nut to beapplied for securing the head in position.

The above description refers to devices concealed or inclosed within thecasing or shell of the machine, and on the outside thereof there islocated an annular ring or wheel, I), which is provided with radiatingarms P', fitted cen trally on the arbor I, which carries the pawl lever.rEhe ring I? is numbered from one to one hundred in a conspicuousmanner, and is provided with a knob or handle for turning the same.

The operation of a machine constructed according to the presentinvention is as follows: Supposin g all the numbered disks to be atzero, which is the case when the lowest number of each disk is oppositethe openings a b in the face of the casing, then, if it is desired toregister a certain number'say, Sb-the external disk is rotated by itsknob until the requisite number is opposite a ,tixed pointer, e, on thecasing at the side of the openings, which will cause the inner ring C tobe moved through the medium of the ratchet-rim and pawl-lever until thedesired number is exhibited through its proper opening in the casing.The spring on the arbor I, which has been coiled up in the act ofturning the outer ring,

will then serve to bring the same back to its normal position by itsexpansive force for repeating the operation. The ring B is moved onetooth or number every time the ring C makes one revolution, for wheneverthe projection on the inner ring comes opposite the spur-Wheel itivillturn the same one tooth, and the outer ring to a corresponding ext-ent.

It will, of course, be apparent that the Wheels or disks may be numberedin any suitable manner to adapt the same for recording different sums ornumbers.

Adding or counting machines constructed as above described are eminentlyapplicable for use in measuring lumber, and in order to render them moreportable and capable of being easily carried I provide them with a loopor curved plate, S.

In order to prevent the number l on the outer disk or Wheel I) frombeing retracted by the spring L beyond the slots a and b in the casing,Which would render the operation of the device impracticable, I providethe under side of the plate K with a-pivoted cam, g, having shoulders g1g2, and recesses to form a projection, g3, and also provide the plate H,which carries the pawls and moves with the outer disk P, with astationary disk, f, having a rounded projection, f. By this means theouter disk can be moved to the right to the desired extent, but will bearrested after one revolution by the projection on the disk f coming incontact with the projection g3, and moving` the said cam until one ofits shoulders comes in contact With a stop, 71 in the plate la.

By releasing the outer disk l? the paul-carrying plate and said disksWill be retracted to their normal position by the spring L, but the diskwill be arrested when the number l comes opposite the slots c b by theother shoulder of the cam g coming in contact with the stop h.

In order to turn the numbered disk B back to Zero after it has been usedfor indicating or registering, I provide the toothed Wheel M With a stemor shank, M', which projects beyond the easing A, and is provided with ascrew-button, N. By turning this button the disk B is turned backWithout any movement of the other parts.

that I claim is- 1. The combination, with the pivoted cam g havingshoulders g1 g2 and projections g, and with the stop h, ot' the arm H,carrying the payvl or pavvls G and the diskf, having projectionj, thewhole constructed to operate substantially as described.

2. rlhe radiating-arms P', attached to the arbor I and carrying thenumbered disk P and an operating-handle, in combination with the plateII, carrying the pawls G, the spurwheel M, and the numbered disk C,having the lun J, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this20th day ot' April, 1871.

CALVIN J. HOLMAN.

Yi'itnesses:

J Anus L. Nonnrs, A. H. Nonnrs.

